How to use the USB connector in special situations

1. High temperature environment: usb connector metal materials and insulating materials determine the connector's operating temperature. High temperature will destroy the edge of the material, cause insulation resistance and voltage resistance performance; for metal, high temperature can make the contact on the loss of elasticity, accelerate oxidation and plating deterioration. The usual ambient temperature of -40 ~ 80 ℃ special occasions may require more. 2. humid environment: relative humidity greater than 80%, is the cause of electrical breakdown to cause. Humid environment caused by water vapor absorption and diffusion on the surface of the insulator, easy to reduce the insulation resistance to below the MΩ level, long-term in a high humidity environment, will cause physical deformation, decomposition, escape generation, respiratory effects and electrolysis, corrosion and cracking. Especially in the equipment outside the usb connector, often have to consider the humidity, water seepage and pollution of the environmental conditions, this case should be selected with sealed connectors.3. Temperature rapid changes in the environment: humidity rapid change test is to simulate the use of the usb connector in the cold environment into the warm environment of the actual use of the situation, or simulation of the space vehicles, detectors, rapid changes in ambient temperature situation. Rapid change in temperature may make the insulation material cracks or layer. 4. thin air environment: in the thin air at high altitude, the plastic puts out gases to contaminate the contact pairs, and make the corona tendency to increase, voltage resistance decreases, so that the circuit produces a short-circuit failure. At high altitude to reach a certain value, plastic performance deterioration. Therefore, the use of non-sealed connectors in high altitude, must be derated. 5. corrosive environment: according to the usb connector used in different use of corrosive environments, the selection of the corresponding metal, plastic, plating structure of the connector, such as the use of the connector in the salt spray environment, if there is no corrosion-resistant metal surfaces, it will make the performance of the rapid deterioration. In the environment containing a considerable concentration of SO2, it is not advisable to use silver-plated contact pairs of connectors. Mold is also an important problem in hot and humid areas.

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